I appreciate your answers, but (1) I manually input the data per the above information, (2) input my iCloud compliant password and still cannot connect for outgoing Mail. Connection Doctor indicates that the identity is offline, but that does not make sense.

Yes I can sign in at iCloud on the Internet and Mail works perfectly on my MacBook, which has OS 10.7 Lion. I believe that the isse may be in "Description" in the Advanced menu of the Mail Preferences on the iMac.

Should the Description be "iCould" or "Mail" or "My Identity'?? I somehow believe that such is preventing me from going online.

I have no idea what happened, but it started working after I rebooted the iMac.

I would appreciate your advice however, on the "Description" issue.

Also, the "IMAP Path Prefix" issue. What should this be?

Thank you very much for your assistance, which I appreciated very much.

I'm in a bit of a mess as well I'm afraid and would appreciate any guidance.

I am on IOS 5 on the iphone and Lion on my Mac.Have just moved from Mobile Me to iCloud which is all fine except the mail on the Mac doesn't work anymore ( in or out). Keeps asking for my password.

I noticed you said the password must be iCloud compliant which it wasn't. Have tried changing this in Mail>preferences>password but nothing has changed. I don't understand how the phone mail app is working fine using the non compliant password??

When I look in Mail preferences (on my Mac) the incomming mail server is greyed out and has a 3 digit alpha numeric prefix to 'imap.mail.me.com. Is this correct? If not, how can I correct it as it's non modifiable.

My outgoing server (SMTP) is using Mobile Me (icloud) in the drop down which I presume it defaulted to when I made the switch.

Many thanks inadvance

Update. when I send mail to myself from icloud on the web from my mac I get a delivery has failed notification: Reason: unknown or illegal alias

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